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  • Raymond Toy's avatar
    Better exp-integral-e computation and fix for incomplete-gamma-tail. · c388f817
    Raymond Toy authored
    For exp-integral-e, use the series for small z and the
    incomplete-gamma-tail for near the negative real axis.  Otherwise, use
    the continued fraction.
    
    In incomplete-gamma-tail, we were using the continued fraction instead
    of the incomplete-gamma function for the region just below the negative
    real axis.  We should use the cf except in that region.
    c388f817